Any water I know of around here above the Roubidoux is so hard and nasty you have to chew it but you will never need a laxative. People around here that know would rather have rural water than electricity. Our well, before rural water, was 300’ deep and poor in volume and quality. It is the coal seams I guess. We had to replace the lifetime glass lined water tanks just about yearly. The water would corrode the bronze jets in the jet pump inside a year. I know, Dad and I pulled the two strings of slick poly pipe many times and it was heavy!
All this in spite of having nearly 50 inches of rain a year.
Some of the few older folks around here, I am nearing that status myself, say if you go below 150’ forget about it so I am considering building a drilling rig and try a hole or two. We water the garden from the pond and that seems to work OK.
I surveyed with Dad in Michigan in the 50s. Flat as a pool table. You could run a line of levels for miles and not vary more than a few tenths.
Tenths of what? I've heard this about Michigan before (oddly enough, from some musician, from the stage, and he was from the real pool table, Indiana) and been puzzled by it. It isn't a mountain range, lots of flat *spots* that were formerly glacial meltwater late beds (the muck farms are found there now), but is hilly.